If you're not a competitor, you've just got to go home.

My motto has always been that you can't say, 'Oh, it won't happen to me.' You have to say, 'That can happen to me.' So always be aware that things can happen.

If I cared deeply about what people thought of me, I probably would have never made it out of Compton, California.

Definitely sport matures you, if you let it. It definitely makes you grow up because you have to work so hard that if you can't, then you probably aren't going to have the mental capacity to handle it all. That probably played a role in growing up a little faster than maybe other people.

The most fun part about working out is being done - getting through the workout, let's be honest. But that feeling afterward? Yeah, that's worth it.

For years I felt that I didn't have enough stamina and then, four years ago, I felt like I was not getting enough air but I was diagnosed with exercise-induced asthma. The medicine for asthma never worked.

To stay interested in tennis, I have to mix it up with other things.